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One of the most common questions CIE 9702 students ask is: “Which formulas are given in the exam and which do I have to memorise?” It is a critical question — and one that directly affects how you revise. Spending hours memorising equations that appear on the A Level Physics formula sheet is wasted time. … Read more

Everything in physics begins with measurement. Before you can analyse motion, calculate electric fields, or understand nuclear reactions, you need a clear and precise understanding of basic physical quantities — what they are, how they are classified, and how their units are defined and combined. This is Topic 1 of the CIE 9702 syllabus for … Read more

Every measurement made in a physics experiment carries some degree of imperfection. No ruler, stopwatch, or voltmeter gives a perfectly exact reading — there is always a margin of doubt around every recorded value. This margin is what physicists call uncertainty in physics, and understanding it is not optional for CIE 9702 students. It is … Read more

Of the three forms of uncertainty used in CIE 9702 — absolute, fractional, and percentage — fractional uncertainty is the one students understand least precisely. They know the formula exists somewhere between absolute and percentage, they vaguely recall it is a decimal rather than a percentage, and they apply it inconsistently in multi-step calculations. The … Read more